<template>
  <div class="login_container">
    <el-row>
      <el-col :span="12" :xs="0" />
      <el-col :span="12" :xs="24">
        <el-form ref="loginForms" class="login_form" :model="loginForm" :rules="rules">
          <h1>{{ t('login.login') }}</h1>
          <h2>欢迎来到后台管理页面</h2>
          <el-form-item prop="username">
            <el-input v-model="loginForm.username" :prefix-icon="User" />
          </el-form-item>
          <el-form-item prop="password">
            <el-input
              v-model="loginForm.password"
              type="password"
              :prefix-icon="Lock"
              show-password
            />
          </el-form-item>
          <el-form-item>
            <el-button
              :loading="loading"
              class="login_btn"
              type="primary"
              size="default"
              @click="handleLogin"
            >
              登录
            </el-button>
          </el-form-item>
        </el-form>
      </el-col>
    </el-row>
  </div>
</template>

<script setup lang="ts">
import { User, Lock } from '@element-plus/icons-vue'
import { ElNotification } from 'element-plus'
//引入获取当前时间的函数
import { formatAxis } from '@/utils/formatTime'
//引入用户相关的小仓库
import { useUserStoreWithOut } from '@/store/modules/user'

const { t } = useI18n()
//获取用户相关的小仓库
let userStore = useUserStoreWithOut()
//获取路由器
let $router = useRouter()
//获取路由信息
let $route = useRoute()
//获取el-form组件
let loginForms = ref()
//定义变量控制按钮加载状态
let loading = ref(false)
//收集账号与密码的数据
let loginForm = reactive({ username: '', password: '' })

//登录按钮回调
const handleLogin = async () => {
  //保证全部表单校验通过再发请求
  await loginForms.value.validate()
  //加载效果，开始加载
  loading.value = true
  try {
    //保证登录成功
    await userStore.userLogin(loginForm)
    //判断是否有query参数，如果有则跳转到对应路径，没有则跳转到首页
    let redirect: any = $route.query.redirect
    //编程式导航跳转到首页
    $router.push({ path: redirect || '/' })
    //登录成功的提示信息
    ElNotification({
      type: 'success',
      message: '欢迎回来',
      title: `HI,${formatAxis(new Date())}好`
    })
    //登录成功加载效果消失
    loading.value = false
  } catch (error) {
    //登录识别加载效果消失
    loading.value = false
    //登录失败的提示信息
    ElNotification({
      type: 'error',
      message: (error as Error).message
    })
  }
}

//自定义校验规则函数
const validatorUserName = (_rule: any, value: any, callback: any) => {
  //rule即为数组校验规则对象，value为表单元素文本内容，符合条件callback放行通过，否则注入错误信息
  if (value.length >= 5 && value.length <= 10) {
    callback()
  } else {
    callback(new Error('账号长度至少为5位，至多为10位'))
  }
}
const validatorPassword = (_rule: any, value: any, callback: any) => {
  //rule即为数组校验规则对象，value为表单元素文本内容，符合条件callback放行通过，否则注入错误信息
  if (value.length >= 6 && value.length <= 15) {
    callback()
  } else {
    callback(new Error('密码长度至少为6位，至多为15位'))
  }
}
//定义表单检验配置对象
const rules = {
  username: [
    //required代表这个字段必须要检验，trigger是触发检验表单的时机
    { trigger: 'change', validator: validatorUserName }
  ],
  password: [{ trigger: 'change', validator: validatorPassword }]
}
</script>

<style scoped lang="scss">
.login_container {
  width: 100%;
  height: 100vh;
  background: url('@/assets/images/background.jpg') no-repeat;
  background-size: cover;
}

.login_form {
  position: relative;
  width: 80%;
  top: 30vh;
  background-color: rgba(112, 97, 154, 0.7);
  background-size: cover;
  padding: 2.5rem;
  border-radius: 0.625rem;
}

h1 {
  color: white;
  font-size: 2.5rem;
}

h2 {
  color: white;
  font-size: 1.25rem;
  margin: 1.25rem 0;
}

.login_btn {
  width: 100%;
}
</style>
